[Bug testsuite/12649] reproducer for races of expect incomplete reads

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https://sourceware.org/bugzilla/show_bug.cgi?id=12649

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=2a31c6236de308f7109720230e70b96c5d5b966a

commit 2a31c6236de308f7109720230e70b96c5d5b966a
Author: Pedro Alves <palves@redhat.com>
Date:   Wed Aug 20 18:55:54 2014 +0100

    Integrate PR 12649's race detector directly in the testsuite machinery

    This integrates Jan Kratochvil's nice race reproducer from PR
    testsuite/12649 into the testsuite infrustructure directly.

    With this, one only has to do either 'make check-read1' or 'make check
    READ1="1"' to preload the read1.so library into expect.

    Currently only enabled for glibc/GNU systems, and if
    build==host==target.

    gdb/testsuite/ChangeLog:

        * Makefile.in (EXTRA_RULES, CC): New variables, get from
        configure.
        (EXPECT): Handle READ1 being set.
        (all): Depend on EXTRA_RULES.
        (check-read1, expect-read1, read1.so, read1): New rules.
        * README (Testsuite Parameters): Document the READ1 make variable.
        (Race detection): New section.
        * configure: Regenerate.
        * configure.ac: If build==host==target, and running under a
        GNU/glibc system, add read1 to the extra Makefile rules.
        (EXTRA_RULES): AC_SUBST it.
        * lib/read1.c: New file.

    gdb/ChangeLog:

        * Makefile.in (check-read1): New rule.

-----------------------------------------------------------------------

Summary of changes:
 gdb/ChangeLog                                      |    4 ++
 gdb/Makefile.in                                    |    8 ++++
 gdb/testsuite/ChangeLog                            |   16 +++++++
 gdb/testsuite/Makefile.in                          |   44 ++++++++++++++++++--
 gdb/testsuite/README                               |   41 ++++++++++++++++++
 gdb/testsuite/configure                            |   10 ++++
 gdb/testsuite/configure.ac                         |    9 ++++
 .../expect-read1.c => testsuite/lib/read1.c}       |   16 ++++----
 8 files changed, 136 insertions(+), 12 deletions(-)
 copy gdb/{contrib/expect-read1.c => testsuite/lib/read1.c} (80%)

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